Plot concentric circle on an image

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HAINGKHARRAN GUNASEKARAN
评论： HAINGKHARRAN GUNASEKARAN 2021-6-10
Hello, I wish to draw concentric circles on an image. The radius of each circle is known. The circles are to be plot on the specific position of picture whereby every circle has the same centre. How may i able to do it? The following syntax below is used to generate the concentric circles. I wish to do that on an image. Plus, the circles should be drawn on image with right scalling. Thank you.
%Syntax for concentric circles
theta = [-pi:pi/36:pi];
hold on;
for r=[5,10,15]
plot(r * cos(theta), r * sin(theta))
end

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KSSV
KSSV 2021-6-9
I = imread('peppers.png') ;
[m,n,p] = size(I) ;
C = round([n m]/2) ; % center of circle
th = linspace(0,2*pi) ;
imshow(I)
hold on
% draw concentric circle
for r = 5:5:50
x = C(1)+r*cos(th) ;
y = C(2)+r*sin(th) ;
plot(x,y)
end
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Image Analyst
Image Analyst 2021-6-9
Like
for radius = 5 : 5 : 50
message = sprintf('Click where you want the center to be');
uiwait(helpdlg(message));
[xCenter, yCenter] = ginput(1);
x = radius * cos(th) + xCenter;
y = radius * sin(th) + yCenter;
plot(x, y, '-');
end

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